REPLACING A FAULTY CIRCUIT BREAKER

1) Turn OFF the power at the main power shutoff. Stand on a dry board or rubber mat as you disconnect the power and work on the replacement breaker
2) Remove the cover panel from the circuit breaker box. It is held with screws that turn counterclockwise. Once the panel is removed, check with a voltmeter to make sure the power is off. Be careful to avoid contact with the supply wires connected to the main power shutoff. They are still hot.
3) Switch the handle on the circuit breaker you're replacing to the OFF position.
4) Remove the damaged breaker. The breaker simply pulls out of it's slot in the box. The breaker may be the type that is bolted to the bus bar.

5) Loosen the screw terminals and remove the wires. A single-pole breaker will have one wire attached (usually black). A double-pole breaker will have two wires attached (usually black and red, or black and white).A tandem, or "piggyback" breaker will have twice as many wires attached, since it squeezes two circuits in the space of one.
6) Loosen the binding screws on the new breaker, be sure the handle is in the OFF position.
7) Place the load wire in the terminal lug and tighten securely.
8) Grip the new breaker as shown in fig.4 and plug it firmly onto the mounting base and the bus bar. If it's the type that is bolted in place, bolt it down. Check to make sure the terminal lug is still tight on the wire.
9) Replace the cover panel and switch the main power shut-off ON and the new breaker ON. Test the circuit with a voltmeter.

Adding a New Circuit Breaker
Before adding a new breaker for a new circuit, check with local authorities regarding any special requirements in your jurisdiction, including any necessary permits.
1) Turn OFF thhe power at the main power shutoff. Be careful to avoid contact with the supply wires connected to the main power shutoff. They are always Hot.
2) Remove the knockout in the breaker box for the new breaker. In the side of the box, knock out the circle of metal matching the new breaker location so the cable you are using may be connected properly.
3) Strip the cable insulation to allow enough wire for the connection to the neutral bus bar and the new circuit breaker. Connect the cable to the box with the proper fitting for this.
4) Run the ground wire and the white neutral of the cable to the neutral bus bar when installing in the service panel (Fig 3). Connect to the separate ground and neutral bars, if in a sub panel.

5) Attach the red and/or black wire to the new circuit breaker. Double-pole breakers for 120/240 volt circuits are normally connected with a red and black wire; for straight 240 volt circuits, with a black and white wire;and singlr-pole breakers(in most installations) are connected with just the black wire. Then clip(or bolt) the breaker to one of the box's HOT bus bars.
If the breaker is a double-pole unit, it will take up two spaces in the breaker box . Both wires are considered power wires, and they are fastened to the breaker(Fig 3). The ground wire only is connected to the ground/neutral bus bar. Combination 120/240 breakers use the very same type of double-pole breakers. Here, the white wire is connected to the neutral bus bar.